Pertussis Cases Rise at USC in Los Angeles
University health officials identify six cases of the contagious respiratory illness on campus this fall.
Updated on Oct. 22, 2026 in Asthma
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Pertussis cases are increasing across Los Angeles County, with USC Student Health reporting six confirmed infections among students. The highly contagious bacterial infection, known for prolonged coughing fits, is currently being monitored on campus.
Why it matters
The rise in infections is linked to waning vaccine immunity in young adults who received their last dose five to six years ago. Improved diagnostic testing and reporting protocols have also contributed to the identification of these current cases.
Pertussis, caused by Bordetella pertussis bacteria, has an 80% infection rate among individuals lacking immunity. Symptoms include severe coughing fits that can persist for 10 weeks or longer.
The players
USC Student Health
The campus health service provider responsible for managing student medical needs and disease reporting at the University of Southern California.
University of Southern California
A major private research university in Los Angeles that is currently managing a localized uptick in bacterial respiratory infections.
The details
The disease spreads through air particles released when an infected person coughs or sneezes. USC is actively monitoring the situation using a specialized wastewater surveillance program installed across 10 residential campus buildings.
Timeline
Age 11 or 12 is the standard age for receiving initial pertussis vaccination.
Vaccine immunity against pertussis typically lasts 5 to 6 years.
Increased reports of pertussis were identified at USC during the fall of 2026.
Health Landscape
This story follows a pattern set by the university's wastewater surveillance program in monitoring public health threats on campus. The approach highlights how modern institutions integrate environmental monitoring to supplement traditional clinical diagnostics.
Individuals with asthma or immunocompromising conditions are at higher risk for severe complications from pertussis and should exercise caution. Students can contact USC health services via the MySHR portal or the 24/7 phone line at 213-740-9355 for assistance.
The takeaway
Maintaining awareness of vaccine schedules is essential for young adults as immunity wanes several years after the final dose. Those experiencing persistent coughing or symptoms should seek medical evaluation promptly to prevent further transmission.
Further reading
Learn more about local respiratory health concerns on our Asthma page.
Source note: This article includes information reported by Daily Trojan.
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During a local outbreak of a contagious disease, do you proactively check your vaccination status?
